5. PSU handleRelated LinksSafety instructionsRemoving the power supply unit blankRemoving an AC power supply unitWiring instructions for a DC power supply unitYour system supports up to two –(48–60) V DC power supply units (PSUs).WARNING: For equipment using –(48–60) V DC power supply units (PSUs), a qualified electricianmust perform all connections to DC power and to safety grounds. Do not attempt connecting toDC power or installing grounds yourself. All electrical wiring must comply with applicable localor national codes and practices. Damage due to servicing that is not authorized by Dell is notcovered by your warranty. Read and follow all safety instructions that came with the product.CAUTION: Wire the unit with copper only, unless otherwise specified, use only 10 American WireGauge (AWG) wire rated minimum 90 ºC for source and return. Protect the –(48–60) V DC (1wire) with a branch circuit over-current protection rated 50 A for DC with a high interruptcurrent rating.CAUTION: Connect the equipment to a –(48–60) V DC supply source that is electrically isolatedfrom the AC source (reliably grounded –(48–60) V DC SELV source). Ensure that the –(48–60) VDC source is efficiently secured to earth (ground).NOTE: A readily accessible disconnect device that is suitably approved and rated shall beincorporated in the field wiring.Input requirements• Supply voltage: –(48–60) V DC• Current consumption: 32 A (maximum)Kit contents• Dell part number 6RYJ9 terminal block or equivalent (1)• #6-32 nut equipped with lock washer (1)Required toolsWire-stripper pliers capable of removing insulation from size 10 AWG solid or stranded, insulated copperwireNOTE: Use alpha wire part number 3080 or equivalent (65/30 stranding)Required wires• One UL 10 AWG, 2 m maximum (stranded) black wire [–(48–60) V DC]• One UL 10 AWG, 2 m maximum (stranded) red wire (V DC return)• One UL 10 AWG, 2 m maximum green/yellow, green with a yellow stripe, stranded wire (safetyground)147
